Power generator converting fluid energy into electrical energy and power generation system of the same

Abstract

A power generator has a magnet rotor rotating upon receiving rotating force from a driving source and a stator coil arranged to face magnetic poles of the magnet rotor. The magnet rotor includes a rotary shaft supported by a housing and a permanent magnet. The stator coil includes coreless winding wires arranged to face the magnetic poles and a three-phase output terminal. The coreless winding wires are formed of effective output winding wires and connected with the three-phase output terminal through a switching device. The switching device is connected to a controlling device. The magnet rotor has a discoid shape including the rotary shaft at the center. The coreless winding wires form a pair of coil bodies arranged to sandwich the magnetic poles. The switching device changes the inductance value to a small value or a large value by connecting the winding wires to the three-phase output terminal.

What is claimed is: 
     
       1. A power generator comprising: a magnet rotor that rotates upon receiving rotating force from a driving source; and a stator coil arranged to face magnetic poles of the magnet rotor,
 wherein the magnet rotor includes: 
 a rotary shaft rotatably and axially supported by a housing; and 
 a permanent magnet that forms a plurality of magnetic poles on a concentric circle with the rotary shaft at a center, 
 the stator coil includes: 
 a plurality of coreless winding wires arranged to face the magnetic poles formed in the magnet rotor; and 
 a three-phase output terminal that outputs electric power generated in the plurality of winding wires to outside, 
 the plurality of coreless winding wires are formed from three or multiple of three effective output winding wires and connected with the three-phase output terminal through a switching device to enable switching a total number of turns to a large or small value, 
 the switching device is connected to a controlling device in which the total number of turns is reduced when the rotating force from the driving source is large and the total number of turns is increased when the rotating force is small, 
 the magnet rotor has a discoid shape including the rotary shaft at the center and is configured to form magnetic fields in both front and back surface directions, 
 the plurality of coreless winding wires form a pair of coil bodies on front and back sides that are arranged to face each other to sandwich the magnetic poles in the discoid shape from the front and back surface directions, 
 the coil bodies on the front and back sides that are formed of the plurality of winding wires are configured to have substantially same inductance values, and 
 the switching device changes the inductance value to a small value or a large value by connecting the winding wires of one of the coil bodies on the front and back sides to the three-phase output terminal or connecting the winding wires of both the coil bodies on the front and back sides to the same. 
 
     
     
       2. The power generator according to  claim 1 , wherein the magnet rotor includes the rotary shaft and a plurality of N-S magnetic poles annularly arranged with the rotary shaft at the center,
 the stator coil includes the plurality of coreless winding wires annularly arranged to face the magnetic poles, 
 the N-S magnetic poles of the magnet rotor are formed on a plurality of permanent magnets arranged in such a manner that same magnetic poles are adjacent to each other with the rotary shaft at the center and magnetic pole forming surfaces of soft magnetic core members arranged to be magnetically coupled with each other between the permanent magnets, and 
 corner portions of the plurality of annularly arranged magnetic pole forming surfaces are cut so as to prevent magnetism from concentrating on the corner portions that are adjacent to each other. 
 
     
     
       3. A power generation system comprising:
 a driving rotary shaft that rotates based on external force including wind power and water power; 
 a magnet rotor coupled with the driving rotary shaft; and 
 a stator coil arranged to face magnetic poles of the magnet rotor, 
 wherein each of the magnet rotor and the stator coil has a configuration according to  claim 1 . 
 
     
     
       4. A power generator comprising: a magnet rotor that rotates upon receiving rotating force from a driving source; and a stator coil arranged to face magnetic poles of the magnet rotor,
 wherein the magnet rotor includes: 
 a rotary shaft rotatably and axially supported by a housing; and 
 a permanent magnet that forms a plurality of magnetic poles on a concentric circle with the rotary shaft at a center, 
 the stator coil includes: 
 a plurality of coreless winding wires arranged to face the magnetic poles formed in the magnet rotor; and 
 a three-phase output terminal that outputs electric power generated in the plurality of winding wires to outside, 
 the plurality of coreless winding wires are formed from three or multiple of three effective output winding wires and connected with the three-phase output terminal through a switching device to enable switching a total number of turns to a large or small value, 
 the switching device is connected to a controlling device in which the total number of turns is reduced when the rotating force from the driving source is large and the total number of turns is increased when the rotating force is small, 
 the magnet rotor has a discoid shape including the rotary shaft at the center and is configured to form magnetic fields in both front and back surface directions, 
 the coreless winding wires form a pair of coil bodies on front and back sides that are arranged to face each other to sandwich the magnetic poles in the discoid shape from the front and back surface directions, 
 the coil bodies on the front and back sides that are formed of the plurality of winding wires are configured to have substantially different inductance values, and 
 the switching device changes the inductance value to a small value or a large value by connecting one of the coil bodies on the front and back sides to the three-phase output terminal. 
 
     
     
       5. The power generator according to  claim 4 , wherein the magnet rotor includes the rotary shaft and a plurality of N-S magnetic poles annularly arranged with the rotary shaft at the center,
 the stator coil includes the plurality of coreless winding wires annularly arranged to face the magnetic poles, 
 the N-S magnetic poles of the magnet rotor are formed on a plurality of permanent magnets arranged in such a manner that same magnetic poles are adjacent to each other with the rotary shaft at the center and magnetic pole forming surfaces of soft magnetic core members arranged to be magnetically coupled with each other between the permanent magnets, and 
 corner portions of the plurality of annularly arranged magnetic pole forming surfaces are cut so as to prevent magnetism from concentrating on the corner portions that are adjacent to each other. 
 
     
     
       6. A power generator comprising: a magnet rotor that rotates upon receiving rotating force from a driving source; and a stator coil arranged to face magnetic poles of the magnet rotor,
 wherein the magnet rotor includes: 
 a rotary shaft rotatably and axially supported by a housing; and 
 a permanent magnet that forms a plurality of magnetic poles on a concentric circle with the rotary shaft at a center, 
 the stator coil includes: 
 a plurality of coreless winding wires arranged to face the magnetic poles formed in the magnet rotor; and 
 a three-phase output terminal that outputs electric power generated in the plurality of winding wires to outside, 
 the plurality of coreless winding wires are formed from three or multiple of three effective output winding wires and connected with the three-phase output terminal through a switching device to enable switching a total number of turns to a large or small value, 
 the switching device is connected to a controlling device in which the total number of turns is reduced when the rotating force from the driving source is large and the total number of turns is increased when the rotating force is small, 
 the magnet rotor has a discoid shape including the rotary shaft at the center and is configured to form magnetic fields in front and back surface directions, 
 the plurality of coreless winding wires form a pair of coil bodies on front and back sides that are arranged to face each other to sandwich the magnetic poles in the discoid shape from the front and back surface directions, 
 the coil bodies on the front and back sides are connected with the three-phase output terminal and the controlling device for short-circuiting an output from each coil body is connected to the three-phase output terminal, and 
 the controlling device applies electric brake to the magnet rotor from the front and back surfaces at the time of overload rotation of the driving rotary shaft. 
 
     
     
       7. The power generator according to  claim 6 , wherein the magnet rotor includes the rotary shaft and a plurality of N-S magnetic poles annularly arranged with the rotary shaft at the center,
 the stator coil includes the plurality of coreless winding wires annularly arranged to face the magnetic poles, 
 the N-S magnetic poles of the magnet rotor are formed on a plurality of permanent magnets arranged in such a manner that same magnetic poles are adjacent to each other with the rotary shaft at the center and magnetic pole forming surfaces of soft magnetic core members arranged to be magnetically coupled with each other between the permanent magnets, and 
 corner portions of the plurality of annularly arranged magnetic pole forming surfaces are cut so as to prevent magnetism from concentrating on the corner portions that are adjacent to each other.